feat: List possible parent variants (#6733)

src/lib/features/dependent-features/dependent-features-controller.ts

@@ -15,7 +15,10 @@ import {
     createResponseSchema,
     emptyResponse,
     getStandardResponses,
+    parentFeatureOptionsSchema,
     type ParentFeatureOptionsSchema,
+    type ParentVariantOptionsSchema,
+    parentVariantOptionsSchema,
 } from '../../openapi';
 import type { IAuthRequest } from '../../routes/unleash-types';
 import type { DependentFeaturesService } from './dependent-features-service';
@@ -29,6 +32,10 @@ interface FeatureParams extends ProjectParams {
     child: string;
 }
 
+interface ParentVariantsParams extends ProjectParams {
+    parent: string;
+}
+
 interface DeleteDependencyParams extends ProjectParams {
     child: string;
     parent: string;
@@ -39,6 +46,7 @@ const PATH_FEATURE = `${PATH}/:child`;
 const PATH_DEPENDENCIES = `${PATH_FEATURE}/dependencies`;
 const PATH_DEPENDENCIES_CHECK = `/:projectId/dependencies`;
 const PATH_PARENTS = `${PATH_FEATURE}/parents`;
+const PATH_PARENT_VARIANTS = `${PATH}/:parent/parent-variants`;
 const PATH_DEPENDENCY = `${PATH_FEATURE}/dependencies/:parent`;
 
 type DependentFeaturesServices = Pick<
@@ -136,7 +144,7 @@ export default class DependentFeaturesController extends Controller {
         this.route({
             method: 'get',
             path: PATH_PARENTS,
-            handler: this.getParentOptions,
+            handler: this.getPossibleParentFeatures,
             permission: NONE,
             middleware: [
                 openApiService.validPath({
@@ -153,6 +161,26 @@ export default class DependentFeaturesController extends Controller {
             ],
         });
 
+        this.route({
+            method: 'get',
+            path: PATH_PARENT_VARIANTS,
+            handler: this.getPossibleParentVariants,
+            permission: NONE,
+            middleware: [
+                openApiService.validPath({
+                    tags: ['Dependencies'],
+                    summary: 'List parent feature variants.',
+                    description:
+                        'List available parent variants across all strategy variants and feature environment variants.',
+                    operationId: 'listParentVariantOptions',
+                    responses: {
+                        200: createResponseSchema('parentVariantOptionsSchema'),
+                        ...getStandardResponses(401, 403, 404),
+                    },
+                }),
+            ],
+        });
+
         this.route({
             method: 'get',
             path: PATH_DEPENDENCIES_CHECK,
@@ -227,15 +255,42 @@ export default class DependentFeaturesController extends Controller {
         res.status(200).end();
     }
 
-    async getParentOptions(
+    async getPossibleParentFeatures(
         req: IAuthRequest<FeatureParams, any, any>,
         res: Response<ParentFeatureOptionsSchema>,
     ): Promise<void> {
         const { child } = req.params;
 
-        const parentOptions =
-            await this.dependentFeaturesService.getParentOptions(child);
-        res.send(parentOptions);
+        const options =
+            await this.dependentFeaturesService.getPossibleParentFeatures(
+                child,
+            );
+
+        this.openApiService.respondWithValidation(
+            200,
+            res,
+            parentFeatureOptionsSchema.$id,
+            options,
+        );
+    }
+
+    async getPossibleParentVariants(
+        req: IAuthRequest<ParentVariantsParams, any, any>,
+        res: Response<ParentVariantOptionsSchema>,
+    ): Promise<void> {
+        const { parent } = req.params;
+
+        const options =
+            await this.dependentFeaturesService.getPossibleParentVariants(
+                parent,
+            );
+
+        this.openApiService.respondWithValidation(
+            200,
+            res,
+            parentVariantOptionsSchema.$id,
+            options,
+        );
     }
 
     async checkDependenciesExist(

src/lib/features/dependent-features/dependent-features-read-model-type.ts

@@ -7,7 +7,8 @@ export interface IDependentFeaturesReadModel {
     getOrphanParents(parentsAndChildren: string[]): Promise<string[]>;
     getParents(child: string): Promise<IDependency[]>;
     getDependencies(children: string[]): Promise<IFeatureDependency[]>;
-    getParentOptions(child: string): Promise<string[]>;
+    getPossibleParentFeatures(child: string): Promise<string[]>;
+    getPossibleParentVariants(parent: string): Promise<string[]>;
     haveDependencies(features: string[]): Promise<boolean>;
     hasAnyDependencies(): Promise<boolean>;
 }

src/lib/features/dependent-features/dependent-features-read-model.ts

@@ -2,6 +2,10 @@ import type { Db } from '../../db/db';
 import type { IDependentFeaturesReadModel } from './dependent-features-read-model-type';
 import type { IDependency, IFeatureDependency } from '../../types';
 
+interface IVariantName {
+    variant_name: string;
+}
+
 export class DependentFeaturesReadModel implements IDependentFeaturesReadModel {
     private db: Db;
 
@@ -59,7 +63,7 @@ export class DependentFeaturesReadModel implements IDependentFeaturesReadModel {
         }));
     }
 
-    async getParentOptions(child: string): Promise<string[]> {
+    async getPossibleParentFeatures(child: string): Promise<string[]> {
         const result = await this.db('features')
             .where('features.name', child)
             .select('features.project');
@@ -82,6 +86,35 @@ export class DependentFeaturesReadModel implements IDependentFeaturesReadModel {
         return rows.map((item) => item.name);
     }
 
+    async getPossibleParentVariants(parent: string): Promise<string[]> {
+        const strategyVariantsQuery = this.db('feature_strategies')
+            .select(
+                this.db.raw(
+                    "jsonb_array_elements(variants)->>'name' as variant_name",
+                ),
+            )
+            .where('feature_name', parent);
+
+        const featureEnvironmentVariantsQuery = this.db('feature_environments')
+            .select(
+                this.db.raw(
+                    "jsonb_array_elements(variants)->>'name' as variant_name",
+                ),
+            )
+            .where('feature_name', parent);
+
+        const results = await Promise.all([
+            strategyVariantsQuery,
+            featureEnvironmentVariantsQuery,
+        ]);
+        const flatResults = results
+            .flat()
+            .map((item) => (item as unknown as IVariantName).variant_name);
+        const uniqueResults = [...new Set(flatResults)];
+
+        return uniqueResults.sort();
+    }
+
     async haveDependencies(features: string[]): Promise<boolean> {
         const parents = await this.db('dependent_features')
             .whereIn('parent', features)

src/lib/features/dependent-features/dependent-features-service.ts

@@ -227,8 +227,16 @@ export class DependentFeaturesService {
         );
     }
 
-    async getParentOptions(feature: string): Promise<string[]> {
-        return this.dependentFeaturesReadModel.getParentOptions(feature);
+    async getPossibleParentFeatures(feature: string): Promise<string[]> {
+        return this.dependentFeaturesReadModel.getPossibleParentFeatures(
+            feature,
+        );
+    }
+
+    async getPossibleParentVariants(parentFeature: string): Promise<string[]> {
+        return this.dependentFeaturesReadModel.getPossibleParentVariants(
+            parentFeature,
+        );
     }
 
     async checkDependenciesExist(): Promise<boolean> {

src/lib/features/dependent-features/dependent.features.e2e.test.ts

@@ -12,6 +12,7 @@ import {
     FEATURE_DEPENDENCY_REMOVED,
     type IEventStore,
 } from '../../types';
+import { DEFAULT_ENV } from '../../util';
 
 let app: IUnleashTest;
 let db: ITestDb;
@@ -55,6 +56,7 @@ afterAll(async () => {
 beforeEach(async () => {
     await db.stores.dependentFeaturesStore.deleteAll();
     await db.stores.featureToggleStore.deleteAll();
+    await db.stores.featureEnvironmentStore.deleteAll();
 });
 
 const addFeatureDependency = async (
@@ -93,12 +95,69 @@ const deleteFeatureDependencies = async (
         .expect(expectedCode);
 };
 
-const getParentOptions = async (childFeature: string, expectedCode = 200) => {
+const getPossibleParentFeatures = async (
+    childFeature: string,
+    expectedCode = 200,
+) => {
     return app.request
         .get(`/api/admin/projects/default/features/${childFeature}/parents`)
         .expect(expectedCode);
 };
 
+const getPossibleParentVariants = async (
+    parentFeature: string,
+    expectedCode = 200,
+) => {
+    return app.request
+        .get(
+            `/api/admin/projects/default/features/${parentFeature}/parent-variants`,
+        )
+        .expect(expectedCode);
+};
+
+const addStrategyVariants = async (parent: string, variants: string[]) => {
+    await app.addStrategyToFeatureEnv(
+        {
+            name: 'flexibleRollout',
+            constraints: [],
+            parameters: { rollout: '100', stickiness: 'default' },
+            variants: variants.map((name) => ({
+                name,
+                weight: 1000,
+                weightType: 'variable',
+                stickiness: 'default',
+            })),
+        },
+        DEFAULT_ENV,
+        parent,
+    );
+};
+
+const addFeatureEnvironmentVariant = async (
+    parent: string,
+    variant: string,
+) => {
+    await app.request
+        .patch(
+            `/api/admin/projects/default/features/${parent}/environments/${DEFAULT_ENV}/variants`,
+        )
+        .set('Content-Type', 'application/json')
+        .send([
+            {
+                op: 'add',
+                path: '/0',
+                value: {
+                    name: variant,
+                    weightType: 'variable',
+                    weight: 1000,
+                    overrides: [],
+                    stickiness: 'default',
+                },
+            },
+        ])
+        .expect(200);
+};
+
 const checkDependenciesExist = async (expectedCode = 200) => {
     return app.request
         .get(`/api/admin/projects/default/dependencies`)
@@ -111,8 +170,8 @@ test('should add and delete feature dependencies', async () => {
     await app.createFeature(parent);
     await app.createFeature(child);
 
-    const { body: parentOptions } = await getParentOptions(child);
-    expect(parentOptions).toStrictEqual([parent]);
+    const { body: options } = await getPossibleParentFeatures(child);
+    expect(options).toStrictEqual([parent]);
 
     // save explicit enabled and variants
     await addFeatureDependency(child, {
@@ -136,7 +195,7 @@ test('should add and delete feature dependencies', async () => {
     ]);
 });
 
-test('should sort parent options alphabetically', async () => {
+test('should sort potential parent features alphabetically', async () => {
     const parent1 = `a${uuidv4()}`;
     const parent2 = `c${uuidv4()}`;
     const parent3 = `b${uuidv4()}`;
@@ -146,8 +205,20 @@ test('should sort parent options alphabetically', async () => {
     await app.createFeature(parent3);
     await app.createFeature(child);
 
-    const { body: parentOptions } = await getParentOptions(child);
-    expect(parentOptions).toStrictEqual([parent1, parent3, parent2]);
+    const { body: options } = await getPossibleParentFeatures(child);
+    expect(options).toStrictEqual([parent1, parent3, parent2]);
+});
+
+test('should sort potential parent variants', async () => {
+    const parent = uuidv4();
+    await app.createFeature(parent);
+    await addFeatureEnvironmentVariant(parent, 'e');
+    await addStrategyVariants(parent, ['c', 'a', 'd']);
+    await addStrategyVariants(parent, ['b', 'd']);
+
+    const { body: variants } = await getPossibleParentVariants(parent);
+
+    expect(variants).toStrictEqual(['a', 'b', 'c', 'd', 'e']);
 });
 
 test('should not allow to add grandparent', async () => {

src/lib/features/dependent-features/fake-dependent-features-read-model.ts

@@ -15,7 +15,11 @@ export class FakeDependentFeaturesReadModel
         return Promise.resolve([]);
     }
 
-    getParentOptions(): Promise<string[]> {
+    getPossibleParentFeatures(): Promise<string[]> {
+        return Promise.resolve([]);
+    }
+
+    getPossibleParentVariants(): Promise<string[]> {
         return Promise.resolve([]);
     }
 

src/lib/openapi/spec/index.ts

@@ -117,6 +117,7 @@ export * from './outdated-sdks-schema';
 export * from './override-schema';
 export * from './parameters-schema';
 export * from './parent-feature-options-schema';
+export * from './parent-variant-options-schema';
 export * from './password-schema';
 export * from './pat-schema';
 export * from './patch-schema';

src/lib/openapi/spec/parent-variant-options-schema.ts

@@ -0,0 +1,16 @@
+import type { FromSchema } from 'json-schema-to-ts';
+
+export const parentVariantOptionsSchema = {
+    $id: '#/components/schemas/parentVariantOptionsSchema',
+    type: 'array',
+    description:
+        'A list of parent variant names available for a given parent feature. This list includes strategy variants and feature environment variants.',
+    items: {
+        type: 'string',
+    },
+    components: {},
+} as const;
+
+export type ParentVariantOptionsSchema = FromSchema<
+    typeof parentVariantOptionsSchema
+>;